#include <ngx_core.h>
#include <ngx_http.h>

static ngx_int_t ngx_http_mytest_module_handler(ngx_http_request_t* r)
{
    if(!(r->method & (NGX_HTTP_GET | NGX_HTTP_HEAD)))
        return NGX_HTTP_NOT_ALLOWED;

    ngx_int_t rc = ngx_http_discard_request_body(r);
    if(rc != NGX_OK)
        return rc;

    ngx_str_t type = ngx_string("text/plain");
    ngx_str_t response = ngx_string("Hello World!");
    r->headers_out.status = NGX_HTTP_OK;
    r->headers_out.content_length_n = response.len;
    r->headers_out.content_type = type;

    rc = ngx_http_send_header(r);
    if( rc == NGX_ERROR || rc > NGX_OK || r->header_only)
        return rc;

    ngx_buf_t *b;
    b = ngx_create_temp_buf(r->pool, response.len);
    if(b==NULL)
        return NGX_HTTP_INTERNAL_SERVER_ERROR;

    ngx_memcpy(b->pos, response.data, response.len);
    b->last = b->pos + response.len;
    b->last_buf = 1;

    ngx_chain_t out;
    out.buf = b;
    out.next = NULL;

    return ngx_http_output_filter(r, &out);
}

static char* ngx_http_mytest(ngx_conf_t *cf, ngx_command_t *cmd, void* conf)
{
    ngx_http_core_loc_conf_t *clcf;

    clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);

    clcf->handler = ngx_http_mytest_module_handler;

    return NGX_CONF_OK;
}

static ngx_command_t ngx_http_mytest_commands[]={
    {
        ngx_string("mytest"),
        NGX_HTTP_MAIN_CONF |  NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_NOARGS,
        ngx_http_mytest,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL
    },
    ngx_null_command
};

static ngx_http_module_t ngx_http_mytest_module_ctx = {
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
};

ngx_module_t ngx_http_mytest_module = {
    NGX_MODULE_V1,
    &ngx_http_mytest_module_ctx,
    ngx_http_mytest_commands,
    NGX_HTTP_MODULE,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NGX_MODULE_V1_PADDING
};
